A numbered series of sound packs for the OP-1 and OP-1 field, each one rebuilding the factory patches of a classic synthesizer as OP-1 presets. Volumes so far cover the Roland JP-8, J-60 and J-106, the Yamaha DX7, the Korg M1 and the Memorymoog, among others. Each volume is sold separately on Gumroad with a minimum price, and the author's donors get the packs through a donor vault.
